Stone-sawing machine.



No. 755,667. v PATENTED MAR.29,1904.

G. D. HUNTER.

' STONE SAWING MACHINE. APPLIOATIDN'PILED HAY 2 6- 1903.

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- No. 755,667. I PATENTED MAR. 29, 1904. I G. D. HUNTER.

STONE SAWING MACHINE. APPLICATION FILED MAY 26. 1903.

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j UNITED STATES Patented March 29, 1904.

PATENT OFFICE.

STONE-SAWING MACHINE.

SPECIFICATION forming part of Letters Patent No. 755,667, dated March 29, 1904.

Application filed May 26, 1903, SerialNo. 158,862. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE D. HUNTER, a citizen of the United States, residing at Bloomington, in the county of Monroe and State of Indiana, have invented certain new and useful Improvements in Stone-Sawing Machines; and

' I do hereby declarethe following to be a full, clear, and exact description of the invention,

such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improved guide bracket or casting designed, primarily,for use in connection with stone-sawing machines of that type wherein the saws are supported by a swinging frame, the swinging frame in turn being supported by the casting or bracket referred to and guided thereby upon a suitable elongated guiding member. Heretofore in the art these guide brackets or castings have been formed integral throughout and adapted to directly engage the guiding member. By experience it has been foundthat such a construction is not advisable, for the reason that the guiding member frequently warps or for the other reasons becomes irregular throughout its length,particularly because certain portions of the same are used to a greater extent than other portions thereof, with the result that the guide-flange of the casting being adjusted through the medium of its bearingblocks to one portion of the guiding member when. other irregular portions are traveled upon the flanges of the casting being integral therewith are prevented from conforming to such irregularities, and therefore become distorted or broken, and as a result the whole casting has to be replaced byanew one,which is obviously very expensive.

With the foregoing objection in'mind it is primarily the object of the present invention to construct the guide bracket or casting with what I will term a breakable piece, which although constituting, a part of the guidebracket will be independently movable relative thereto in such a manner that should any undue strain be put upon the bracket said breakable piece will bend or break off before the main casting can become impaired.

Novel details in the arrangement and conor casting and its associated parts. a plan view thereof, parts being shown in sec- I appended claims.

When referring to the drawings, like ref-' erence characters will designate corresponding parts in the several views.

Figure l is a side elevation of the bracket Fig. 2 is tion. Figs. 3 and 4: are detail cross-sectional views. Fig. 5 is a vertical sectional view. Figs. 6 and 7 are views similar to Figs. 1 and 2, showing a slightly-modified embodiment of the invention; and Fig. 8 isa perspective view of the breakable piece.

Referring more specifically to the drawings,

A designates the top hanger or connectingbar for the ordinary swinging saw-frame, to the respective ends of which the guide brackets or castings Bare rigidly secured, and as these castings are alike throughout one only is shown as applied to one end of the connecting-bar.

C is an elongated metallic guide over which the bracket or casting is adapted to work as the saw-frame is elevated and lowered. The casting has one flange, 6, adapted to slide upon one edge of the metallic guide, and is also provided with an oppositely-disposed L-shaped flange'b, extending around the other edge of the guide a suflicient distance therefrom to be at all times away from contact therewith. To afford a proper rigidity to the parts and prevent lateral movement of the bracket, bearingblocks D are interposed between the L-shaped flange 6 and the adjacent edge of the metallic guide. Ordinarily-these bearing-blocks have been adjusted through the medium of screwbolts passing directly through the flange of the casting, so that if the same becomes cramped, owing to the irregularities of the .metallic guide, one of the flanges of the casting would break off, thus destroying the .whole of the same. In the present instance the proper pressure is applied to the bearingblocks through the medium of screws E, contacting with the outer surface thereof and passing loosely through apertures b in the L- fiange. The outer portion of the screws have a screw-threaded engagement with the ends of an elongated plate F, which I have heretofore styled the breakable plate. Intermediate of its ends this breakable plate is held in place in proper relation to the casting by means of a bolt 6, passing loosely through an aperture 6 in the plate and having a screwthreaded engagement 6 with the 'L-flange. From this arrangement it will be understood that should the casting be caused to travel upon those portions of the metallic guide which are irregular, whereby the same is cramped or otherwise strained, the bearing-blocks will be to a certain extent automatically adjustable outwardly through the L-flange by reason of the fact that the breakable plate is of sucha character that its opposite ends will give slightly under ordinary circumstances or in case of excessive strain will break off, so that all strain of whatsoever nature ordinarily exerted upon the expensive casting itself is relieved therefrom. The upper and lower ends of the breakable piece are provided with reinforced overhanging portions f, adapted to extend above and below the free end of the L- flange, so as to retain in place between the same and the inner surface 0 of the metallic guide additional bearing-blocks G, the said blocks being of the shape shown in Fig. 3, provided with the offset portions 9, adapted to fit between said flanges f and the outer surfaces of the L-fiange. (Also shown in dotted lines, Fig. 1.) The blocks F, heretofore referred to, are of the same shape as the blocksG and are arranged to over and under lie the upper and lower surfaces, respectively, of the casting and be confined against vertical play by flanges f, extending inwardly from the top and bottom of the breakable plate.

While in the above disclosure a particular construction has been described, it is to be understood that various changes and alterations may be made in the arrangement and construction of the several parts without in the least departing from the spirit of the invention and that minor features may likewise be entirely dispensed with, as in the embodiment illustrated in the last two figures of the drawings.

Referring now to Figs. 6 and 7, it will be seen that the parts are in general the same as in the embodiment heretofore described with the following exception: The oppositely-disposed flanges h 71. on the casting H a're'alike in character, and the bearing-block interposed between one of the same and the surface of the metallic guide is confined against vertical play bya bolt 73, passing through a slot in the bearing-block I and having a screw-threaded engagement with the body of the casting. The'breakable plate J, its retaining-screw 7', and the screw for adjusting the bearingblock are all the same as'in the preceding construction.

Having thus described the invention, what is claimed as new, and desired to be secured by Letters Patent, is

1. In combination with a suitable guide member, a bracket adapted to traverse the same having a detachable relatively weakened yieldable portion; substantially as described.

2. In combination with a guide member, a bracket adapted to traverse the same, a bearing-block between a portion of the guide and the bracket, means for retaining the block in place, adjusting means for the block, and a yieldable member associated with said adjustable means, substantially as described.

3. In combination with a suitable guide member, a bracket adapted to traverse the same having suitable engaging portions, and

an independent relatively weakened detachable breakable portion operatively associated with said engaging portions, substantially as described.

4. A guide-bracket having an independent detachable breakable piece secured thereto, substantially as described.

5. In combination with a suitable guide member, a bracket adapted to traverse the same, having suitable projecting portions, a bearing-block interposed between one of said projecting. portions, and the guide member, a breakable plate secured to the exterior of the projecting member adjacent the bearingblock, and an adjusting device for the bearing-block operatively related to the breakable plate and loosely engaging said projecting portion, substantially as described.

6. In combination with a suitable guide member, a bracket adapted to traverse the same having suitable projecting portions, a

' projecting portion adjacent the bearing-block,

and separated adjusting screws working through the respective ends of the breakable erally, and flanges on the breakable piece at the top and bottom thereof adapted to confine the bearing-blocks against independent vertical movement, substantially as described.

9. In combination with a suitable guide member, a bracket adapted to traverse the same having suitable projecting portions,bear ing-blocks interposed between one of said projecting portions and said guide member having offset portions at one end adapted to engage the outer surface of a portion of the bracket, a breakable piece secured to the exterior surface of the projecting portions adjacent the bearing-blocks, means operatively associated with said breakable piece adapted to adjust the bearing-blocks laterally, and overhanging portions at the top and bottom of the GEORGE D. HUNTER.

Witnesses:

-J. M. HARROW,

FRANK P. WOODWARD. 

